# Heart Rate Derived Metrics confusion

**URL:** <https://forum.xertonline.com/t/heart-rate-derived-metrics-confusion/39968>\
**Category:** Support\
**Created:** [April 6, 2022, 9:17am UTC](https://forum.xertonline.com/t/heart-rate-derived-metrics-confusion/39968 "2022-04-06T09:17:01Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![oldcyclist65](https://forum.xertonline.com/user_avatar/forum.xertonline.com/oldcyclist65/32/7374_2.png) [@oldcyclist65](https://forum.xertonline.com/u/oldcyclist65)\
**Post date:** [April 6, 2022, 9:17am UTC](https://forum.xertonline.com/t/heart-rate-derived-metrics-confusion/39968/1 "2022-04-06T09:17:01Z")

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Can someone please help me as I’m totally confused with the Derived from HR data.

I’m not sure what’s going on with my Derived from HR runs that are imported into Xert via Strava. One minute they have xss numbers and the next they don’t. Then the next they do. I’m completely confused.

“Enable the estimation of Xert Metrics like XSS and Focus using Heart Rate” is enabled in my account settings.

None of my imported runs over the last 2 weeks have xss numbers anymore, yet they did yesterday.

 ![confused-1](https://forum.xertonline.com/uploads/default/original/2X/a/afc8574778e154c63d9cd05b216e6d0fcd23e8a2.jpeg)  
 ![confused-2](https://forum.xertonline.com/uploads/default/original/2X/2/2364d5dbdfb16ed78c8a5fc6b1122984d85e95e0.jpeg)

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**Author:** ![Mordy111](https://forum.xertonline.com/user_avatar/forum.xertonline.com/mordy111/32/7024_2.png) [@Mordy111](https://forum.xertonline.com/u/Mordy111)\
**Post date:** [April 6, 2022, 11:02pm UTC](https://forum.xertonline.com/t/heart-rate-derived-metrics-confusion/39968/2 "2022-04-06T23:02:23Z")

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Can’t help you but dying to know how those activities got their names 😂